Edited excerpt from Eurekalert:
Researchers found that employees’ moods when they clocked in tended to affect how they felt the rest of the day. Early mood was linked to their perceptions of customers and to how they reacted to customers’ moods, and had a clear impact on performance, including both how much work employees did and how well they did it.
“We saw that employees could get into these negative spirals where they started the day in a bad mood and just got worse over the course of the day,” said Steffanie Wilk, associate professor of management and human resources at Ohio State University’s Fisher College of Business. “That’s why it is so important for companies to find ways to help their workers start off the day on the right foot.”
Notes:
(1) How can individuals ensure they start their day happy? Eric Barker suggests: (i) ensure you have something to look forward to from the night before, (ii) ensure the first thing you do gives you a feeling of control, (iii) eat breakfast, (iv) send a “thank you” email to someone, (v) kiss someone you love, (vi) plan how you’ll deal with changes, and (vii) do something you dread.
(2) Any ideas for how companies can “find ways to help their workers start off the day on the right foot”?
A Founder's Notebook 
Within reason let your employees start and end their days when they want to. Being stressed in the morning because you have to get everyone up and ready and get to work “on time” can’t help with the morning mood.